why do some things float and others sink

why do some things float and others sink

Students are given a plastic tub filled with a variety of materialsвwood of different sizes and shapes, a pencil, a marble, a styrofoam ball, a cork, a plastic spoon, a rubber band, a penny, a toothpick, a paper clip, and whatever else is handy. They are asked to predict which objects will float and which will sink when placed under the level of the water and let go. Students perform the experiment and compare the results to their predictions. They discuss why they thought certain objects would sink/float. The class brainstorms a list of properties of the different objects that may affect whether the object floats or sinks. Using the objects they already have, students do simple tests to rule out some of the properties (such as color, shape, etc). In the end, it should be apparent that

 why muslim prayer 5 times a day

why muslim prayer 5 times a day

According to Prophet Muhammad, the only thing that separates Muslims from non-believers is the prayers. It is the second pillar of Islam after the declaration of faith. Islam is based on five pillars and if one is missing then the whole building collapses. There is no other religion which instructs its followers to pray five times a day therefore Salah is the identity of Muslims. Muslims are ordered to pray five times a day at specific times; before sunrise, midafternoon, late afternoon, sunset and at night. Both the Quran and the Hadith of the Prophet strongly emphasizes the vitality of the five daily prayers in Islam. Salah is a way of totally submitting to the wills of Allah and showing gratitude to him because as Muslims, we donБt bow before anyone but Allah the Almighty. Allah the

 why do sperm cells have many mitochondria

why do sperm cells have many mitochondria

Eggs (ova) and sperm have half the number of chromosome One of the rod shaped bodies found in the nucleus of cells that contain genetic information (DNA). of normal body cells. They are called haploid cells rather than diploid An organism or cell that contains two copies of each chromosome. cells. A single egg cell is called an ovum. Collectively, eggs and sperm are called gametes or sex cells. When fertilisation occurs, an egg (ovum) and a sperm fuse to form a zygote. Eggs and sperm have several important adaptations linked to their structure. An egg cell (ovum) is one of the largest cells in the human body and can just be seen without using a microscope. Each egg cell has a haploid nucleus - containing only half the number of chromosomes of a normal cell nucleus. ...

 why is my curly hair so dry

why is my curly hair so dry

1. Cover the sink with before detangling your hair. Never clog the sink again. 2. When detangling your hair, use your fingers or a instead of a brush to prevent breakage and preserve the shape of your curls. 3. When combing or brushing your hair, gradually move upward instead of starting at the roots. It's much easier to comb through knots at the ends first. 4. Before stepping into the shower, apply a to your hair, tuck it into a, and wash your body before washing your hair as normal. The steam from the shower will help lock in moisture. 5. Mix a small amount of with a lot of conditioner to make your own cleansing conditioner, which gently washes while it deeply moisturizes. Apply the mixture to the crown of your head and thoroughly massage it into your scalp, focusing on just the roots

 why is weathering important to the process of erosion

why is weathering important to the process of erosion

A natural process affected by human activities, erosion causes soil or layers of soil to be moved or worn away. Erosion is a potential environmental issue because it usually washes away nutrient-rich topsoil from lands. This can prevent future generations of plants from growing in eroded areas. Because of this, erosion is considered one of the most influential natural forces in nature. Erosion occurs mainly because of water. Increased amounts of water tend to overflow onto land. As the water increases, the soil becomes over-saturated with water. According to a Virginia Tech environmental professor, most of the soil particles end up flowing with the water sources, such as lakes, rivers or the ocean. The end result is high amounts of soil particles in water sources and a lack of soil, or

 why do nsaids increase risk of heart attack

why do nsaids increase risk of heart attack

Commonly prescribed painkillers increase the likelihood of having a within the first month of taking them if consumed in high doses, a study suggests. All five nonsteroidal anti-inflammatory drugs ( ) examined could raise the risk as early as the first week of use, an international team of researchers found. They concluded that there was a greater than 90% probability that all the NSAIDs they studied were associated with a heightened risk of heart attack. The overall odds of having a heart attack were about 20% to 50% greater if using NSAIDs compared with not using the drugs, although it varied for the individual drugs assessed, which also included naproxen, celecoxib and rofecoxib. As it was an observational study, cause and effect could not be established conclusively. Nevertheless the

 why do people take breaks in relationships

why do people take breaks in relationships

Any Friends fan knows that taking a break from a relationship can getPtricky:PRemember when Pand Ross ran into "the hot girl from the Xerox place with the belly button ring"? Yeah, that didn't end well. And perhaps unsurprisingly, taking a break IRL can getPcomplicated too. But in some cases,Ptime apartPcan actually help strengthen a couple's bond,Paccording to therapists. Of course if one person initiates a break because theyve really just identified someone else they want to hook up with, thats not the best plan, says Holly Richmond, PhD, a sex therapist inPLos Angeles. For a breakPto be helpful rather than hurtful, the partners need to share the same expectations for their time off, she says. Rachel Needle, PsyD, a psychologist at the Center for Marital and Sexual Health of South

 why is there so much violence in america

why is there so much violence in america

In his first weekly address of 2016, Barack Obama vowed to take executive action to increase background checks on gun buyers. His announcement followed another bloody year in the US in which thousands were killed and tens of thousands wounded by gunfire. Here's a look at some of the statistics behind the violence. Mass shootings: There were 372 mass shootings in the US in 2015, killing 475 people and wounding 1,870, according to the Mass Shooting Tracker, which catalogues such incidents. A mass shooting is defined as a single shooting incident which kills or injures four or more people, including the assailant. Source: School shootings: There were 64 school shootings in 2015, according to a dedicated campaign group set up in the wake of the Sandy Hook elementary school massacre in

 why do we fast on ash wednesday and good friday

why do we fast on ash wednesday and good friday

Current practice of fast and abstinence is regulated by Canons 12501253 of the 1983 code. They specify that all Fridays throughout the year, and the time of Lent are penitential times throughout the entire Church. All adults (those who have attained the 'age of majority', which is 18 years in canon law) are bound by law to fast on Ash Wednesday and Good Friday until the beginning of their sixtieth year. All persons who have completed their fourteenth year are bound by the law of abstinence on all Fridays unless they are, and again on Ash Wednesday; but in practice this requirement has been greatly reduced by the Episcopal Conferences because under Canon 1253, it is these Conferences that have the authority to set down the local norms for fasting and abstinence in their territories.

 why do the chicago bears have gsh on their uniforms

why do the chicago bears have gsh on their uniforms

Photo Source :P America loves their. But aside from the, virtually no other NFL franchise can rival the Chicago BearsPin terms of overall history. Once called the Decatur Staleys in 1920, the Chicago Bears have retired 14 jersey numbers; the most in the NFL and the third most in professional sports. While this is the ultimate tribute to the club's former players, a more significant tribute has been worn on the sleeves of the Chicago Bears' uniforms for 30 seasons now. P "GSH" was added to the sleeves of the Bears' uniforms before the start of 1984 NFL season to honor it's founding father - George Stanley Halas. Often referred to as the "Papa Bear", Halas was the Chicago Bears owner from 1920 to Halloween of 1983 when he passed away from cancer. The son of Greek-Slavic immigrants, Halas

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